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Thank you. This helped me. It was due to shared secret was not added during the validation. Yes I do recently added a autorenewable subscription IAP into my app and was testing it with my sandbox user and that probably explain why this happen.I would monitor and update again if there's any other errors along the way. Thanks PBK

Thanks PBK for your prompt reply. What you mean is for subscription i have to include my shared secret when i'm validating the receipt.1. How about for normal non renewable consumable products? Would it break if I include the shared secret?2. Does the subscription follows a Apple ID? meaning to say if i subscribe to my app using email@domain.com, and i change device and sign in using email@domain.com, i would continue to enjoy this subscription on another device?3. Do I need to do this?Code:check receipt if its subscription first with shared secretif (21004) {check if its non renewable consumable product without shared secret}4. If 3 is the right way, would it count the non renewable consumable product as being bought twice?Really appreciate your help.